<html>
  <script language="Javascript">
    a = null;
    a = a + 1;
    a = a - 1;
    a = a * a;
    a = a / a;
    a = 'hello' + ' world';
    a = "hello" + " world";
    a = 'helloa';
    a = "helloa";
    a += a;
    a -= a;
    a *= a;
    a /= a;
    a = a && b & c;
    a = a || b | c;
    a &= a;
    a |= b;
    a = f ^ g;
    a ^= g;
    a = (b * c) / ((d * e) ^ f);
    a = !!a;
  </script>
</html>